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QMSI Special SEMINAR – “Symmetry Control of the Anomalous Hall Effect in Altermagnetic MnTe”
February 11, 2026 @ 11:00 am - 12:00 pm
“Symmetry Control of the Anomalous Hall Effect in Altermagnetic MnTe”
Prof. Alberto De la Torre Duran
Northeastern University
Feb 11, 2026, 11:00am – 12:00pm
Venue: Elliott Hall – Room 130C
147 South Bedford St, Burlington, MA
The seminar is both in person and online
Abstract:
Altermagnetism is a recently identified magnetic phase that unites the spin-polarized electronic bands of ferromagnets with the compensated magnetic order of antiferromagnets via unconventional symmetry operations. Controlling the Anomalous Hall Effect in altermagnets is fundamental for spintronic devices. In strained MnTe/GaAs films, the magnitude and polarity of the AHE were unexpectedly tuned by field-cooling (FC). Here, we present a combined X-ray magnetic circular dichroism (XMCD), circular dichroism resonant inelastic X-ray scattering (CD-RIXS), photoemission, and Raman study in thin films of the altermagnetic α-MnTe [1]. Our combined spectroscopy study reveals a symmetry reduction in MnTe/GaAs, allowing a non-zero Dzyaloshinskii–Moriya interaction while maintaining the spin-split electronic and magnetic structure. We interpret the tunability of the AHE in terms of a novel term in the Landau theory enabled by magnetostriction. Altogether, our data demonstrates that substrate strain and symmetry engineering open a pathway toward next generation of magnonic and spintronic devices based on altermagnets
Special SEMINAR hosted by Quantum Materials and Sensing Institute (QMSI)